66870017 has 2 divisors, whose sum is σ = 66870018. Its totient is φ = 66870016.

The previous prime is 66869983. The next prime is 66870059. The reversal of 66870017 is 71007866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 1324801 = 8096^2 + 1151^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66870017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66870077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33435008 + 33435009.

It is an arithmetic number, because the mean of its divisors is an integer number (33435009).

Almost surely, 2^66870017 is an apocalyptic number.

It is an amenable number.

66870017 is a deficient number, since it is larger than the sum of its proper divisors (1).

66870017 is an equidigital number, since it uses as much as digits as its factorization.

66870017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 66870017 is about 8177.4089417125. The cubic root of 66870017 is about 405.8919871693.

The spelling of 66870017 in words is "sixty-six million, eight hundred seventy thousand, seventeen".